Re: 2.6.14: CR4 not needed to be inspected on the 486 anymore?

[Zachary Amsden <zach@vmware.com>]

Maciej W. Rozycki wrote:

> On Mon, 7 Nov 2005, Zachary Amsden wrote:
>
>  
>
> > While this is at least no worse in the nested fault case than earlier 
> > kernels, I really wish I had one of those weird 486s so I could test the 
> > faulting mechanism.  It seems the trap handling code has gotten quite 
> >    
>
> What's so weird about 486s?  Besides, for testing it doesn't have to be
> one -- you will get away with a 386, too.  I have neither anymore, but
> there are people around still using them.
>  

Because I hold in my hand "i486 Microprocessor Programmer's Reference 
Manual, c 1990", and it has no mention whatsoever of CR4, and all 
documentation I had until Friday had either no mention of CR4, or 
something to the effect of "new on Pentium, the CR4 register ..."  So 
I've had to re-adjust my definition of 486, which was weird.

Zach
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